mason config: remove default options & add better icons

lua/nvchad/configs/mason.lua

@@ -5,20 +5,9 @@ local options = {
 
   ui = {
     icons = {
-      package_pending = " ",
+      package_pending = " ",
-      package_installed = "󰄳 ",
+      package_installed = " ",
-      package_uninstalled = " 󰚌",
+      package_uninstalled = " ",
-    },
-
-    keymaps = {
-      toggle_server_expand = "<CR>",
-      install_server = "i",
-      update_server = "u",
-      check_server_version = "c",
-      update_all_servers = "U",
-      check_outdated_servers = "C",
-      uninstall_server = "X",
-      cancel_installation = "<C-c>",
     },
   },